Film exchange

There is an interesting multiple exposure project that I've now heard about a couple of times. It goes something like this: a photographer shoots a roll of film, all under exposed by one stop. Subject matter can be anything the photographer likes. They then rewind that roll and pass it to a fellow photographer, who again shoots the entire roll, using random subjects underexposed by 1 stop. The end result is a series of 2 image multiple exposures, combining potentially disconnected subjects. There was an exhibition in the Guggenheim in New York where the two photographers had deliberately focused on cliche subjects. One had shot exclusively flowers in a standard snapshot fashion and the second had shot postcard sunsets. The heart of this lies in the serendipity and randomness of the images that get combined. I wonder if this could be done digitally, or would the opportunity to creatively direct the combinations sneak in to the process ? I can see shooting 30 images, and passing them on to a friend - but would I not want to edit those images, shoot 60 and pick the 'best' ones ? Then again, when it came to combine the frames, rather than using the random initial sequence, might we not want to pick and choose, reorder and combine the best, or most meaningful, or most ironic or best colour combinations of images? Now ask yourself, would it be better or worse to do this? On one side, you would probably miss out on the happy accidents, the magic of it all falling in to place mostly by accident. On the other side, you'd loose the frustration of near misses, or instances where this subject would be fantastic on this other frame. The pain and frustration of the what ifs would be gone but so would the magic of the real hits. Sure, we could just do both, after all, it's digital you can just rip it up and retry - but where does the real magic and fun lie ? Anyone want to try it out ?